October 30, 2026

CVE Watchtower

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CVE-2025-64394NVD

Vulnerability Summary

A vulnerability allowing a low-privileged local user to write arbitrary files with SYSTEM privileges during the installation of Veeam Backup for Microsoft 365, which can lead to privilege escalation or denial of service.
Severity Level
MEDIUM(4.3)
Published Date
Oct 27, 2026
Last Modified
Oct 27, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.11%Probability
Root Weakness (CWE)
CWE-1386: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v4.0 Base Metrics — Score 4.3 (MEDIUM)
Attack VectorLocal
Attack ComplexityLow
Attack RequirementsPresent
Privileges RequiredLow
User InteractionActive
Confidentiality (Vulnerable System)None
Integrity (Vulnerable System)Low
Availability (Vulnerable System)High
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)None

Affected & Patched Versions

Affected Versions
  • Veeam Backup for Microsoft 365 >= 8.0 and <= 8.6.0.1102
Patched Versions
  • Veeam Backup for Microsoft 365 8.6.0.1102
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🚫Ad-Free — Uninterrupted experience.
🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.

External References